Advertisement

Journal of Materials Science

, Volume 42, Issue 10, pp 3315–3320 | Cite as

Particle size and support effects on the complete benzene oxidation by Co and Co–Pt catalysts

  • Silviya TodorovaEmail author
  • Georgi Kadinov
  • Krasimir Tenchev
  • Yuri Kalvachev
  • Vladislav Kostov-Kytin
Size-Dependent Efects

Abstract

Monometallic cobalt and bimetallic Co–Pt samples of various particle sizes have been prepared using SiO2 and synthetic kenyaite (layered silicate) as a support. They are characterized by elemental analysis, XRD, TPR, and XPS. Cobalt is introduced by two methods—classical impregnation and ammonia method. The ammonia method of preparation leads to the formation of finely dispersed Co3O4 on both supports. Besides, hardly reducible cobalt silicate phases appear predominantly on the SiO2 support. The Co3O4 particle size varies between 5 and 20 nm, depending on the support. The monometallic Co samples prepared by ammonia method on both supports are more active in benzene combustion than the impregnated ones due to the finer dispersion of the easily reducible Co3O4. Addition of Pt improves the activity and the promoting effect is more evident for the impregnated sample. This is explained with the synergy effect of cobalt oxide species and Pt. The less promoting effect of Pt on the catalytic activity of the bimetallic kenyaite-supported samples is attributed to the stronger interaction between the Co oxide phase and Pt during the preparation process.

Keywords

Cobalt Volatile Organic Compound Co3O4 Cobalt Oxide Temperature Program Reduction 

Notes

Acknowledgements

Financial support by the National Science Fund—the Bulgarian Ministry of Education and Science under Contracts No. NT 1-02 and X-1317 and by the Joint Research Project between Bulgarian Academy of Sciences and Academy of Sciences of the Czech Republic is gratefully acknowledged. A part of this work is performed in the framework of the Joint Research Project between Bulgarian Academy of Sciences and University of Sevilla. The authors would like to thank Prof. G. Tyuliev for XPS and helpful discussion. Yu. K. is indebted to the Alexander von Humboldt Foundation for equipment donation.

References

  1. 1.
    Thormahlen P, Skoglundh M, Fridell E, Anderson B (1999) J Catal 188:300CrossRefGoogle Scholar
  2. 2.
    Cunningham DAH, Kobayashi T, Kamijo N, Haruta M (1994) Catal Lett 25:257CrossRefGoogle Scholar
  3. 3.
    Chai Kin S (2002) J Hazard Mater B91:285Google Scholar
  4. 4.
    Papaefthiniou P, Ioannides T, Verykious XE (1997) Appl Catal B 13:175CrossRefGoogle Scholar
  5. 5.
    Milt VG, Ulla MA, Lombardo EA (2001) J Catal 200:241CrossRefGoogle Scholar
  6. 6.
    Torncrona A, Skoglundh M, Thormählen P, Fridell E, Jobson E (1997) Appl Catal B 14:13CrossRefGoogle Scholar
  7. 7.
    Ataloglou T, Fountzoula C, Borikas K, Vakros J, Lycorghiotis A, Kordulis C (2005) Appl Catal B 57:297CrossRefGoogle Scholar
  8. 8.
    Menezo JC, Riviere J, Barbier J (1993) React Kinet Catal Lett 49:293CrossRefGoogle Scholar
  9. 9.
    Kalvachev Y, Kostov-Kytin V, Todorova S, Tenchev K, Kadinov G (2006) Appl Catal B 66:192CrossRefGoogle Scholar
  10. 10.
    Barbier A, Hanif A, Dalmon J-AL, Martin GA (1998) Appl Catal A 168:333CrossRefGoogle Scholar
  11. 11.
    Petkov V, Bakaltchev N (1990) Appl Crystallogr 23:138CrossRefGoogle Scholar
  12. 12.
    Zhecheva E, Stoyanova R, Tyuliev G, Tenchev K, Mladenov M, Vassilev S (2003) Solid State Sci 5:711CrossRefGoogle Scholar
  13. 13.
    Kanazirev V, Price GL, Tyuliev G (1992) Zeolite 12:846CrossRefGoogle Scholar
  14. 14.
    Shanke D, Vada S, Hilmen EA, Hoff A (1995) J Catal 156:85CrossRefGoogle Scholar
  15. 15.
    Milt VG, Ulla MA, Lombardo A (2001) J Catal 200:241CrossRefGoogle Scholar
  16. 16.
    Colter KE, Saultр AGJ (1995) J Catal 154:56CrossRefGoogle Scholar
  17. 17.
    Okamoto Y, Nagata K, Adach T, Imanaka T, Imamura K, Takyu T (1991) J Phys Chem 95:310CrossRefGoogle Scholar
  18. 18.
    Haddad GJ, Goodwin JG (1995) J Catal 157:25CrossRefGoogle Scholar
  19. 19.
    Ming H, Baker BG (1995) Appl Catal A: General 123:23CrossRefGoogle Scholar
  20. 20.
    Skoglundh M, Johansson H, Lowendahl L, Jansson K, Dahal L, Hirschauer B (1996) Appl Catal B 7:299CrossRefGoogle Scholar
  21. 21.
    Moulder JF, Sticke WF, Sobol PE, Bombel KD (1992) In: Castain J (ed) Handbook of X-ray photoelectron spectroscopy, 2nd edn., Perkin-Elmer Corporation, Physical Electron Division, Minnesota, USAGoogle Scholar
  22. 22.
    Moreno-Tost R, Santamaria-Gonzalez J, Rodriguez-Castellon E, Jimenez-Lopez A (2004) Appl Catal B 52:241CrossRefGoogle Scholar
  23. 23.
    Zsoldos Z, Garin F, Hilaire L, Guczi L (1996) J Mol Catal 111:113CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Silviya Todorova
    • 1
    Email author
  • Georgi Kadinov
    • 1
  • Krasimir Tenchev
    • 1
  • Yuri Kalvachev
    • 2
  • Vladislav Kostov-Kytin
    • 2
  1. 1.Institute of CatalysisBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Central Laboratory of Mineralogy and CrystallographyBulgarian Academy of SciencesSofiaBulgaria

Personalised recommendations